Is there a good #contaminant checklist? Just had to tell a researcher that the sample they have been working on and I ran over the SEC-MALS for them, probably is the infamous ArnA his-tag purification contaminant from E. coli (100% Mw and ext. coeff. match). journals.iucr.org/d/issues/202...
ArnA contamination was independently observed during the purification of a soluble, low-yield protein complex, leading to an unintended 3.23 Å resolution cryo-EM structure. This work broadens recent f...
